Template:Source games/Valve

Release date	Title	Co-developed with	Engine branch	Platforms	Notes
7 Oct 2004	Counter-Strike: Source	Turtle Rock Studios Hidden Path Entertainment (2010 update)	Source 2004 (launch) Team Fortress 2 branch (currently)	PC: Windows, Mac, Linux	First game to use the Source engine. Remake of Counter-Strike. Hidden Path Entertainment alongside Valve worked on the May 7, 2010 update, which upgraded the game's engine from Source 2006 to 2009 (MP version, later renamed to Source MP), and added 144 (now 146) achievements, a new domination and revenge system similar to Team Fortress 2, player stats and more. Hidden Path Entertainment also worked on the unreleased Xbox 360 port of CS:S, which would later become Counter-Strike: Global Offensive after Valve saw the opportunity during its development to turn the port into a new game. Mac version of the game was later release in June 2010, and Linux in 2013.
16 Nov 2004	Half-Life: Source		Source 2004 (launch) Source 2013 Singleplayer (currently)	PC: Windows, Mac, Linux	Remaster of Half-Life. It is critically panned by most gamers since 2013 due to the huge amount of bugs that were introduced when the game was updated to Source 2013. Prior to the 2013 update, it received mixed reviews by critics and most gamers, some players are disappointed over the game graphics (especially the textures) that are unchanged from the original, while also having a realistic Source's 3D Skybox and water effects. A unofficial fan remake of Half-Life, called Black Mesa was later started development in response of those criticisms, which was first released in 2012 without any Xen chapters and was much shorter, and later in 2020, a full release with contains the Xen chapters.
16 Nov 2004	Half-Life 2	EA UK (PS3 port)	Source 2004 (launch, ) Source 2007 (only in ) Source 2013 Singleplayer (currently)	PC: Windows, Mac, Linux Console(s): Original Xbox, Xbox 360, PlayStation 3 Mobile: Android (NVIDIA Shield)	Sequel to Half-Life, and later Half-Life: Alyx. Included on The Orange Box. The game was set 20 years after the event of Half-Life, takes place in City 17, which is under Combine control. Prior to its release, it was delayed multiple times, and infamously leaked in Oct 2003. It was among the first games to require Steam in order to play. Half-Life 2's engine branch has been updated multiple times, first in 2007, upgraded to Source 2007 only on consoles, and in 2010, upgraded to Source 2009 on PC, and finally, Half-Life 2 was upgraded to the Source 2013 Singleplayer branch. In November 2024, Valve released a 20th anniversary update, which add Steam Workshop support, fixing several bugs, improved shaders (with option to use classic 2004/2006 particles/effects and Very High shader option), and made Half-Life 2: Lost Coast, Episode One and Episode One playable through Half-Life 2 main menu, without quitting the game and launch it separately on Steam client.
30 Nov 2004	Half-Life 2: Deathmatch		Source 2004 (launch) Team Fortress 2 branch (currently)	PC: Windows, Mac, Linux	Multiplayer component of Half-Life 2. Now runs on Team Fortress 2 branch after 20th anniversary update.
26 Sep 2005	Day of Defeat: Source		Source 2004 (launch) Team Fortress 2 branch (currently)	PC: Windows, Mac, Linux	Remake of Day of Defeat. Like Half-Life 2: Lost Coast, it also have features later added to Source 2006, such as HDR lighting.
27 Oct 2005	Half-Life 2: Lost Coast		Source 2004 (launch) Source 2013 Singleplayer (currently)	PC: Windows, Mac, Linux	Originally as part of Half-Life 2, which was cut at some point before it was released, and was developed after the leak happened but was ultimately cut, then later released in 2005 as a HDR lighting technology demo. It runs on a newer version of Source 2004, introducing new features such as Commentary System and HDR (which was previously introduced on Day of Defeat: Source). Both of these new features are later used in Half-Life 2: Episode One, which runs on Source 2006 engine, and subsequent games & branches after it. As of 2025, it runs on Source 2013 Singleplayer.
1 May 2006	Half-Life Deathmatch: Source		Source 2006 (launch) Team Fortress 2 branch (currently)	PC: Windows, Mac, Linux	Multiplayer component of Half-Life: Source. Now runs on Team Fortress 2 branch since February 18, 2025 update.
1 Jun 2006	Half-Life 2: Episode One	EA UK (PS3 port)	Source 2006 (launch) Source 2007 ((only in )) Source 2013 Singleplayer (currently)	PC: Windows, Mac, Linux Console(s): Xbox 360, PlayStation 3 Mobile: Android (NVIDIA Shield)	The game is the sequel to Half-Life 2, and the story begins after the Citadel reactor core was destroyed, Gordon and Alyx both survived the explosion. When it's come to technical, it used the Source 2006 engine branch at launch, and it is the last Valve game to be released on the Old Engine branch. Included in The Orange Box.
10 Oct 2007	Half-Life 2: Episode Two	EA UK (PS3 port)	Source 2007 (launch, currently used on & ) Source 2013 Singleplayer (currently)	PC: Windows, Mac, Linux Console(s): Xbox 360, PlayStation 3 Mobile: Android (NVIDIA Shield)	A sequel to Half-Life 2: Episode One. The City 17 has been destroyed, and the Citadel was partially collapsed, Gordon and Alyx has survived the train crash. The game largely take places in White Forest. Story aside, when it's come to technical, it uses the Source 2007 at launch, originally called as The Orange Box engine branch and it is the first iteration of the New Engine branch. Included on The Orange Box.
	Portal			PC: Windows, Mac, Linux Console(s): Xbox 360, PlayStation 3, Nintendo Switch (part of Portal Companion Collection) Mobile: Android (NVIDIA Shield)	A completely new game and IP from Valve, set in the Half-Life universe, and take places in Aperture Laboratories. It is a puzzle-based shooter game, allowing you to create portals, that link to one another on any flat and large enough surface. In 2023, an unofficially remastered version of the game, Portal with RTX, was released, which takes advantage of hardware that support ray-tracing, and adds PBR textures, high polygon models in order to improve the game graphics. Like the other two new games in The Orange Box package, it used the Source 2007 engine at launch.
	Team Fortress 2		Source 2007 (launch, currently used on & ) Team Fortress 2 branch (currently)	PC: Windows, Mac, Linux Console(s): Xbox 360, PlayStation 3	Sequel to Team Fortress Classic, focusing on cartoon graphics unlike the pre-release footage/screenshots, which aimed to be more realistic. This is the last game, along with 2 other games as part of The Orange Box pack to use the engine branch that requires Half-Life 2 assets to operate. The console version of the game is no longer updated, as opposed to PC version of the game, which is frequently updated. It has its own version of Source 2013 Multiplayer which is more up to date and has newer features in what's named the Team Fortress 2 branch.
17 Nov 2008	Left 4 Dead	Turtle Rock Studios (under Valve South)	Left 4 Dead engine branch (earlier version)	PC: Windows, Mac Console(s): Xbox 360	A new multiplayer co-op game, with a horror zombie theme. It use a new engine branch which does not require Half-Life 2 assets in order to work, it also adds many new features and introduced VPKs.
17 Nov 2009	Left 4 Dead 2		Left 4 Dead engine branch	PC: Windows, Mac, Linux Console(s): Xbox 360	Originally was planned to be an update for Left 4 Dead, it was later released as standalone game. Like Left 4 Dead, it also runs on the same L4D branch, but much newer. Like TF2, the console version () of the game is no longer updated, as opposed to PC version of the game. This game was also ported to Source 2 back in 2014, but this version remains unreleased to this day, and one of its maps has been remade in Source 2 as a tech demo back in 2010, which its image was leaked in 2014.
19 Jul 2010	Alien Swarm		Alien Swarm engine branch	PC: Windows	A co-op alien shooter, which was a remake of the Unreal Tournament 2004 mod with the same name. It succeeded the Left 4 Dead engine branch and adds new features on its branch.
18 Apr 2011	Portal 2		Portal 2 engine branch	PC: Windows, Mac, Linux Console(s): Xbox 360, PlayStation 3, Nintendo Switch (part of Portal Companion Collection)	Has its own engine branch, and once again, introduced new features and succeeded Alien Swarm engine branch. Sequel of Portal. For the first time since 2007, the PlayStation 3 version was developed by Valve themselves, and does not suffer various issues that The Orange Box on PS3 had, such as poor optimization, and high-pitched audio issue.
21 Aug 2012	Counter-Strike: Global Offensive	Hidden Path Entertainment	CS:GO engine branch	PC: Windows, Mac, Linux Console(s): Xbox 360, PlayStation 3	Sequel to Counter-Strike: Source, originally developed as a Xbox 360 port of Counter-Strike: Source before Valve eventually turned it into a new Counter-Strike game. The game runs on the CS:GO engine branch, which is based off of the Left 4 Dead engine branch with Portal 2 engine branch code. CS:GO used Source 1 engine until 2023, now uses the new Source 2 engine under the name Counter-Strike 2, replacing CS:GO (except the console version). Console version is no longer updated since 2013, but remains purchasable. Prior to being delisted, it was Free to Play on PC since 2018.
9 Jul 2013	Dota 2		Dota 2 engine branch (Pre-Reborn)	PC: Windows, Mac, Linux	Sequel to 2003's Warcraft III mod, Defense of the Ancients (retroactively called as Dota 1, DotA for short). Formerly using Source until 2015, when it was switched to Source 2, as part of Dota 2's Reborn update. This is also the last Valve game to be released on the Source engine.